Glad you feel all is going well
I had been reading your thread as you seem to be in a similar position as we were a few weeks ago.
We adopted Harry from a sanctuary as company for Molly our house rabbit who gets free range of the downstairs. We did the slow bonding with cages side by side for weeks but we found that when they were out in the garden together there was aggression. We then tried the bath (a neutral area) - not a good move - it was too hard to keep control in that situation. Eventually we cordoned off a 2ft by 3ft area in the utility room. There was humping, and grunting but no real aggression. (Humping is normal unless it is back to front). After a few days we made the area slightly larger. I couldnt bear to keep them enclosed for too long so still let them out in the garden when i could but
the tips i was given on this site really seemed to say that the confinement to a small area would increase the bond quicker.
Molly and Harry have now moved into the full sized utility room with toys, litter trays and bedding - they never made it back into their cage and roam inside
and out when we are at home. They groom each other and snuggle up together - they are companions but not infatuated with each other, but maybe that will come.
I wish you well, you will get there.